It's continuously difficult for me to track the autopsy timeline in the face of so much contradictory evidence. Doug Horne theorized that the throat wound was discovered by the autopsy doctors at 11:00 - 11:45 PM, which may be close enough to midnight to justify the 11/23/1963 date on Dr. Humes' handwritten note (and, after all, Dr. Perry recalled a second later phone call that Humes never mentioned). Still trying to completely reconcile all of the evidence now that I understand that the Gawler's team Joe Hagan, John Van Hoesen, and Tom Robinson all recalled viewing the autopsy from the very beginning at 8:00 PM.
But, of course, all that is an appendix compared to the fact that so many witness stated the autopsy doctors discussed the original throat wound at the autopsy and even probed it.
The Barnum diary is dated 11/29/1963, it mentions a back wound and possibly that it came from a bullet which exited the throat, and yet the only publicly available information about the existence of a back wound came a few days later in December. You could try saying that Barnum somehow overheard some people in Bethesda discussing the autopsy, but at that point why not accept his story about Dr. Burkley coming in and discussing the autopsy findings among them "around midnight"?
This written record should not exist if it comes from 11/29/1963, and yet it does.
Not that you even need Barnum's written summary of events to acknowledge the other evidence that the autopsy doctors knew about the throat wound.